21222210111 has 32 divisors (see below), whose sum is σ = 29069568000. Its totient is φ = 13767418368.

The previous prime is 21222210089. The next prime is 21222210133. The reversal of 21222210111 is 11101222212.

It is an interprime number because it is at equal distance from previous prime (21222210089) and next prime (21222210133).

It is not a de Polignac number, because 21222210111 - 2¹⁵ = 21222177343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222210011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12064050 + ... + 12065808.

It is an arithmetic number, because the mean of its divisors is an integer number (908424000).

Almost surely, 2^21222210111 is an apocalyptic number.

21222210111 is a deficient number, since it is larger than the sum of its proper divisors (7847357889).

21222210111 is a wasteful number, since it uses less digits than its factorization.

21222210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21222210111 its reverse (11101222212), we get a palindrome (32323432323).

The spelling of 21222210111 in words is "twenty-one billion, two hundred twenty-two million, two hundred ten thousand, one hundred eleven".